SLP Performance 21047 Cold-Air Kit Review(s)

About SLP Performance

History and information about SLP Performance and their products.

Since 2001, LMPerformance has worked closely with SLP Performance to offer customers a wide range of performance enhancements to the American muscle car, the best known of which is its SLP Loudmouth muffler and SLP Camaro systems. With our SLP Performance parts line we have helped customers transform late-model rides into modern muscle cars like the Camaro SS and Pontiac Firehawk.

True to its name, Street Legal Performance (SLP) has a vision "to not just provide performance, but to do so with the best engineering practices and quality possible, far exceeding the industry standards." Impressively, SLP was the first company in the performance aftermarket to develop and manufacture a 50-state emission-legal performance package specifically for V8 Camaros and Firebirds. LMPerformance carries SLP's best-in-class performance upgrades in the following product categories: TVS Supercharger Packages, Blackwing Cold Air Intakes, SLP Exhaust Tips, SLP Loudmouth Mufflers, Powerflo Headers, SLP Accessories, SLP Suspension, SLP Brake Kits and SLP Wheels. The range of applications offered by the SLP line is equally as wide. Below is just a partial list: Chevy Camaro, Corvette, GM/GMC Trucks and SUVs, Pontiac Firebird, GTP, G8, GXP and GTO, Ford Mustang and F-150, Dodge Challenger, Charger, Magnum and 300.

More SLP Performance 21047 Cold-Air Kit Review(s)

cold Intake package, Date: 10/14/2010

By: jksz28Ownership: 1 month - 1 year

It was a little aggravating to install. I have ran other intakes and cant say that I noticed a difference in between slp's and other brands. It does sound nice. Is worth the money not by much tho.

By: Arqtec59Ownership: more than 1 yearSlp's Cold Air Induction Package Kit worked great for about 12 years on my 2002 Camaro Z-28, I purchased this Camaro new in 2002 and treated the car with excellent care, 13 years out and only 39000 miles. My mods worked well till a RAINY day in May and 5&quot; of water at 1-2 miles an hour, at 1200rpm HYDRO-LOCKED the motor.........2 rods cracked the block and it was BYE-BYE to a my ole faithful LS-1.......Hello, LS376/525 crate engine from GM. I am now configuring a similar system to the C-5 Corvette with a intake bridge and a ram horn split filter if it will fit. The SLP down duct work is not totally to blame for the death of my LS1. The air dam that smooths under car air flow was positioned with a forward angle to scavenge more air to enter the SLP duct. The duct was extended with additional sheet metal and increased efficiency by 25%..........this works fine with 02, not with H20.....that's air not water, for those of you that slept thru Chemistry. My only concern now, after paying off my creditcards 10,000.00 balance, is the positioning of this new CAI and MAF. The LS3 motor in the 525 hp asa cam version is particular to the MAF position from the TB and current opinion is 10 &quot; away and in a straight section of tube, also the resisters in the Granatelli 85mm MAF may not communicate well with the aftermarket tuners, so I guess its HP professional tuner time. Sure hope this Bad Boy doesn't eat my 4L60E and 10 bolt rear end, but I can't wait to see the vet owners and new Camaro guys listen to that 110LSA, then I crack the electronic cutouts open, and see if these Nitto sticky tires can hold on to the road, while the other guys try to find a gear that works...............stay away from puddles.

By: LbstoneOwnership: 1 month - 1 yearGreat Product that's easy to install. I noticed only a slight increase in the sound on startup but no difference while driving. The only difference while driving was some burbling on deceleration. Even swapping out the factory muffler only slightly increased the sound.

By: Blurple DenaliOwnership: more than 1 yearInstalled on 2010 Yukon Denali 6.2L. Highly recommend this product. Very high quality piece. Easy to install, looks great and b/c you''re deleting the final resonator, it''s sounds awesome! Only slight increase in exhaust note but, not obnoxious and slight burble on deceleration.

By: ScottOwnership: 1 week - 1 monthDelivery was a nightmare. After they finally arrived thins went down hill. The Power Flo is too quiet - quieter than my Silverado! Fit was horrible. Had to pay muffler shop to take everything apart, cut, and refit. The power flo muffler connections were bent entirely wrong, so we removed them completely and fabricated tailpipes to tips. This allowed the tips to be spaced properly and aligned the same. No more SLP for me

By: HuckOwnership: 1 day - 1 weekAs someone else said a bit load...Just what I wanted.You can definatley tell the difference.Pay some one $100 to install for you.Only downside..parts are right an left an not marked.because the way car is constructed this makes a difference .Installer had to put pipes on an take off a couple times to get rt an left on right so they angles the right way.Didnt have to drop sway bar as instructions indicated.You don't unbolt muffler at back an drop down you disconnect pipe at header an drop that down an take mufflers off that way.Marking rt an left an a little more instruction would help but love the rumble

By: NancyOwnership: 1 day - 1 weekThe pipe is certainly a nicer than the stock y-pipe. It's supposed to fit without any issues on my 2002 TA. The holes for the flanges to connect to the catalytic converters are too far apart and had to grind the inner so it would fit like it's supposed to. The outlet is shorter than the stock y-pipe. Going to bring this to an exhaust shop and let them fiddle with it and get it to fit properly. It will be nice once it's done, but not happy about having to bring it elsewhere.

By: NancyOwnership: 0 - 1 dayHad to elongate the flange holes. They were wayyyyyy too wide for the catalytic converters bolts. What a pain in the a$$. And as noted in other reviews, the output y tip is a bit shorter than the stock y pipe.

By: SimonOwnership: 0 - 1 dayI really like the exhaust; but I was incredibly hesitant to buy for weeks because I just didnt get a serving-justice sound (confidence) in the exhaust. I tried youtube, but there are no videos for this exhaust on a 2013 LT model. A possible clip of its sound would do awesome...! Thanks

By: AutomaticWinOwnership: 1 day - 1 weekAfter having to drill out the passenger side flange, because it was way to small for the bolts and buying nuts for those bolts because they weren't included, the install went very well and the out come is a very very happy customer, love the sound especially combined with SLP Loudmouths and BBK shorty header. I'd recommend theses X-pipes to anyone want a very loud and VERY aggressive sound...now just to install the BBK Throttle Body that i bought along with theses X-pipes good job SLP and LMPerformance for getting them to me before Christmas...

By: 2000CamaroSS#2930Ownership: 1 day - 1 weekGot this system to replace the flowmaster that was currently on the car. I don't know what series it was but it was to quiet. Had this installed and noticed a difference in power and throttle response compared to the previous system. The exhaust is more throatier. I know some people talk about the cabin drone but as long as you have the stock manifolds and cats the drone is not bad at all so far I only noticed it at 1800 rpm's in 5th gear but highway speeds in 6th gear is deep and little drone. Couple this with the SLP air lid and you will notice differences throughout the RPM range

By: Ls1earsOwnership: more than 1 yearWasnt sure weather ta get tha lm 1 or 2 so ta stay sound ordinence safe and I have no complaints. Its loud super aggressive and deep. I have tha cats removed and 1 loudmouth II that "y's" into 3 1/2 tips and its deep. Very satisfied but im changing to the loudmouth 1 because I want stupid loud lol. But if you want a good deep agressive muscle car sound thats just loud enough tha loudmouth 2 is tha way to go!!!

By: outlawOwnership: 1 day - 1 weekvery pretty muffler very good build quality on par with the like of borla and other exceptional brands better yet sounds awesome great all round muffler be ware very loud which is what i wanted, but if you dont find something quieter

By: AJOwnership: 1 week - 1 monthJust purchased a set of Loudmouth 1 resonator's about 2 weeks ago.
Fast shipping, And they sound absolutely amazing!!!
Real Mean Agressive Tones... Custom istalled them on a Cadillac Eldorado with the northstar single exhaust with Y pipe in the rear and 10 out of 10 on the sound. The best sound i have ever heard.. You must buy! yull be shocked, music to your ear's if your looking for a real mean sound and you want Loud buy them, not as loud as you would think inside the car just pure mean agressive sound...yull havta experience it to believe it! just be easy on that pedal when you pass the law lol they are LOUD. Very Pleased!!! defintly worth it.

By: Mike02Ownership: 1 day - 1 weekDefinitely a great addition to the v6 camaro improves the sound way better than the stock exhaust definitely recommend it and super easy to install lift was not necessary

By: vette07Ownership: 1 day - 1 weekI listened to tons of sound clips. Then decided to do it right or leave it if you really want a change to stock exhaust.It is significantly louder and I guess it turns some heads. Sounds and feels great- also the tips look awesome.
If you want that the look no further!

By: AnonymousOwnership: 1 week - 1 monthOther then a pain trying to get the MAF sensor to slide into the neck (instruction say to heat up the airlid neck with a blow dryer), the lid really does clean up the engine bay. Car is a little more noisy when leaning into since the baffles are removed, but otherwise performance is way better. Definitely worth it.

By: BryOwnership: 1 week - 1 monthI had this product profesionally installed, and the shop estemated 6 to 8 hours three days later they were just finishing up. I am not sure if it was just the set that I got or what happened. All other SLP parts I have purchased have been awesome!!! However these rubbed on everything under the car. Also made it impossible to run the EGR no big deal, but still thats beside the fact. The kicker was when the performance shop told me all that time and there was still one bolt that they could never even get on! I will admit they looked awesome on the table and sound great but as far as fitment goes they do not receive high marks on this product. P.S. don''t try to install these at home you will hate your life

By: Insert name Ownership: 1 day - 1 weekI noticed a difference as soon as I hit the gas the first time, not a big difference but definitely 5-7whp and noticeably better throttle response. Install is straight forward, you definitely need to use a hair drier to get the mad back on, other than that easy hp.

By: big poppa pumpOwnership: 1 week - 1 monththis loudmouth is very loud , still debating on removing factory resonator aka mid muffler for x pipe ..think i will do it though this summer def .. everyone def looks when im rolling down the street now just right not to crazy of a sound .i will be posting a video on you tube soon ..i did not like any of the videos showing this sytem on a g8 gt so when i make it it will be from every angle . inside ,outside,startup,takeoff,burnout,ext

By: ButchOwnership: 1 day - 1 weekwe had to replace the y pipe due to the customer running thier car off road the OEM y pipe is nonexistant, i was almost ready to have one made to finish this job then i found this one on LM performance on a web search, i was realy not sure it would work but i was desparate,i also ordered a pair of magnaflow 49 state direct fit catalytic converts, i have to tell you these three parts saved me some hassle they are great the difference between the oem y pipe and the new one is the oem is flat and looks restrictive, the new one is round and "full open" these parts fit as good as OEM only difference is the center "exhaust" crossmember had to be taken off for clearance and it is realy not anything but a scrape guard.

By: 2012SVTSnakeOwnership: 1 day - 1 weekDefinitely worth the price! Loud aggressive tone! This is my third vehicle with the SLP LM1's and I'm sure it won't be my last. SLP = great quality, great price, and awesome sound. LMPerformance = fast shipping, and great pricing...
Here's a quick clip of the exhaust..
http://www.youtube.com/watch?v=mmA9e7u7Zwg&feature=share

Current Mods:2012 GT500, all stock with the exception of the SLP Loudmouth axle back

By: JEFF ZOwnership: 1 day - 1 weekI couldn''t be happier!!! This exhaust was exactly what I was looking for. SOUNDS GREAT!!! And easy to install.
As far as shipping goes, it only too THREE DAYS. ordered it on Friday and had it installed TUESDAY A+++++++ SHIPPING!!!

By: TONY FROM EVANS, GAOwnership: 1 day - 1 weekI had a Flowmaster 80 series on the stock tail pipes with the rectangular tips. It really sounded good, but I wanted something louder. My son suggested the LMII mounted as a single muffler and dumping it before the rear axle. Well, I was surprised at the sound!! It really sounds great on the Camaro since it is low to the ground and the sound is amplified bouncing off the pavement. I must say I do miss the look of the dual tips I had, but I'll get over it. There is a drone sound inside, but I like the aggressive sound and generally ride with the windows down and the radio turned down. A great product by SLP!!

Current Mods:My car is a B4C edition. It came with quite a few extras including the LS6 intake and block. I added the SLP Air Lid a few months ago.

By: 04GTOLUVOwnership: 1 month - 1 yearThis system sounds great. but if you have crabby neighbors who dont know a thing about cars or the appreciation of good old american muscle,Id get something a little less aggressive. This system WILL wake them up and get the cops called. If you driver your car everyday you might want something a little more quiet. The system sounds great but can get on your nerves when your in the drive thru. If your looking for that NASCAR sound this is the package to get.

By: corvettejonesyOwnership: 1 month - 1 yearSimply put, these sound very aggressive, throaty, and loud. There is some resonance at particular RPM's, but since I have a six speed, it can easily be accomodated for. I have had these for about six weeks, and someone yells out their car window at me about once a week telling me how good this car sounds. The sound clip on here is good, but in real life they sound deeper and throatier than on the video. Nice 'burble' type sound when deaccelerating. All around great sounding pipes!!

By: 11'GT/CSOwnership: 1 day - 1 weekLet me tell you all something. I've owned 3 Mustangs. My 2011 GT is the quietest stock than the others (04'GT, and 10' GT) Soo 3 days ago I recieved my SLP's.. which only took 2 business days to get here!! Super fast shipping!! I work at a dealership which I had them install on a lift which took less than 30 min. When they started my car up, EVERYONE circled around, and the only thing anyone said was OMG that sounds GOOD! I have gotten over 20 compliments from around my dealership in the past 2 days. Be aware they are LOUD!!! People are BLOWN away when you tell them all you have is axle-backs, they think you are bluffing. THESE ARE THE REAL DEAL FOLKS !!!! 5 stars to SLP and 5 stars for LM performance for price and quick shipping!!!

By: JackOwnership: 1 day - 1 weekI installed my SLP 2011 Mustang GT Loudmouth Axle-Back Exhaust pipes in an apartment parking lot with a carjack so it took me a little longer than an hour, but not much. I installed one side and checked the difference. Couldn't even hear the stock side. After installation put it on the road. Had to idle out of the complex as to not disturb them. Got out on the freeway and hit 6th gear and the resonance in the car was so great had to go back to 5th and thought that I had overdone it. After driving in 5th for about 10 miles on my way back to the apartment I tried 6th and the computer had evidently made corrections for the different pressures and temperature etc. because now it was a sound like no other. The true heartbeat of a thoroughbred 5.0 that is running loose on the open range. I am showing a mpg increase of close to 5 mpg if I can keep my foot out of it, which is hard to do. This is with supper Unleaded 93 octane. You have to own it to appreciate it. As I said in the Title it is AAAAAUUUUSSSUUUUMMMMM! They will unleash the hidden power within

Current Mods:The SLP 2011 Mustang GT Loudmouth Axle-Back Exhaust is my first Modification to my unbelievable 5.0. This needs no explanation,if you own one.

By: Camaro guyOwnership: 1 day - 1 weekI recently installed this system and it definitely does change the sound quite a bit from quiet to VERY loud. I have no complaints about this product as long as you never drive over about 2,500 RPM in which case, it sounds great. The problem is that when you get up into the higher RPM's, it goes from a deep grumble to a Tokyo Drift style tonka toy. I feel embarassed to even take off fast because of that and about 4 days into owning it, I have already ordered the Flowmaster axel back system to install in its place which based on youtube videos, sounds great all the way up to the red line. It still has the V6 sound, but at least it still sounds American...

By: GizzmoOwnership: 1 day - 1 weekAfter ALOT of research I decided to go with the Loudmouth 2 axle back for my 2010 V6 automatic Camaro. It sounds better than the video! LM Performance delivered in 2 days and was very helpful. Quick install. I had a Flowmaster shop put it in and they were inpressed. The SLP Loudmouth 2 is better in quality and sound. I am sooooo happy! :-)

By: GTOOwnership: 0 - 1 dayinstalled system in 30 minutes/perfect fit/sounds great/looks great,worth every penny.thanks to LMperformance for processing order quickly.slp makes a great exhaust system for the gto.

By: csrcamaroz28Ownership: 1 day - 1 weekThis is a nice loud muffler it sound like you mean buisness nice rummble with alot of noice

Current Mods:this is a nice part i got aftermarket wires plugs intake headers exhaust and tuned. i am pushing 385hp with this set up the intake is slp the headers are slp the exhaust is a y pipe slp and the

By: MIKEYZOwnership: 0 - 1 dayI just put these on my 99 Z28 an oh my god i got in my car and cranked it over, it made that LS1 Growl! Item was shipped in about 4 days, I was very impressed. I would reccommend this site an the SLP Loudmouth II to anyone with a F-Body!!!

By: junky vanOwnership: 1 day - 1 weekI have to say that I am very pleased with the SLP Loudmouth exhaust! The installation was a snap... took about an hour. The sound is incredible!! This was my first mod on my Camaro and I have to say it turned this V6 from a tame kitty purr to a fierce lion roar!
The product is well made and very solid plus the tips look awesome. I would recommend this to anyone who wants to enhance the engines sound and turn a few heads along the way.

By: SScamaro2000Ownership: 1 day - 1 weekI had SLP's long tube headers installed on my 2000 SS camaro along with the Loudmouth 1 exhaust. The performance and sound from these two components is awesome. If you want the meanest and loudest then I recommend these. Just a note, if you're putting these on the Camaro my "service engine soon" light started to come on after install.

By: csganttOwnership: 1 day - 1 weekThe sound is absolutely the meanest I've heard in a long time. Exceeded my expectations just as indicated by the previous review. The poor little Mustangs pulling up next to me look frightened :)

Current Mods:SLP long-tube headers and SLP LM-1 exhaust on a 2000 SS camaro.

By: davyOwnership: 1 week - 1 monthexhaust sounds better than stock. stock is boring and silent, powerflow adds volume without giving you a head ache. not likely to get you attention from cops, but loud enough to get some looks. interior rumble at low rpms is kind of loud and can get old and it sounds ok when opened up. regular cruising speed sounds nice without being "loud". if you really want attention and like to listen to your engine scream, but still want to be able to use the car as a daily driver, go for loudmouth 2. if you want the loudest without just being too much, go for loudmouth 1. if you want your ears to bleed, get rid of the cats and keep the lm1

By: wbenn5Ownership: 0 - 1 dayThe sound that comes out of the Loudmouth II is awesome!! Well above the expected sound. Gives the V6 a V7 like sound that reverberates through around town cruising. Above 3000 rpm transforms the low growl to a roar and an ear to ear grin on the driver.

By: AnonymousOwnership: 1 day - 1 weekI love these exhaust. It is by far the best invest i could make. There perfect. There loud enough to turn heads but when you get up to 5th gear its a nice lil rumble but not to loud to get on your nerves either. i love em.

By: mattOwnership: 1 day - 1 weekquick delivery on LM's part; got to me within 2 days. Took about 4 hours to put the catback on as I ran into issues removing the stock unit. The SLP catback is made well and fitted together good. The instructions it came with weren't the greatest, but it did its job. Overall fitment of the parts was good. I had a slight clearance issue with the pipe over the rearend, but nothing too bad. Sound is good, idle is a bit louder and deeper than stock. Under load, it is louder (cabin noise isn't much higher) and definately has more rumble and less drone than the stock exhaust. This is a great system for the price.

By: CrawdaddyOwnership: 1 week - 1 monthPersonally the install was easy, directions were simple. Fit and finish is good. I love the sound that it delivers, not so much for the wife. I warned her for over 2yrs this was going to happen. Now, she isn't so pleased. I even got a guy with a Viper RT/10 to snap his head and give the thumbs up! Noticed a gas mileage increase already, as long as you keep your foot out of the pedal! With the 4 cyl shut down, you can really hear the note change at cruising speeds, and I think it makes it easier to stay in that fuel saver mode. Thanks for the product, really enjoy it.

By: GTRACEROwnership: more than 1 yearI was running long tubes, O/R H pipe, and these SLP LM1 and the car was AGGRESSIVE and sounded AWESOME!!! There was nothing that sounded this mean on the street!! It was loud enough to hear me for miles!!!! Get this exhaust if you looking for mean and raw power sound!

Current Mods:2000 Mustang GT - Full bolt ons, full suspension, with nitrous.

By: GeneOwnership: 1 day - 1 weekJust installed the SLP Loudmouth axle back system, sounds great. Installation was a little tricky as the exsisting system had a stud that had to be ground down to allow the SLP pipe to go over the forward exhaust system. Also the SLP passenger side pipe hanger rod had to be re-bent a little in order for the pipe to run straight out the back.
The driver side went on with no problem, all in all it took about 1.5 hours - only because I had to grind off the studs on the exsisting system and bend one rod.

By: VilhelmC4Ownership: 1 week - 1 monthThe SLP Cold Air Intake for the LT1/LT5 Corvette is an interesting addition. It is as the manufacturers claim, support up to an additional 20 HP based on application. As i applied this to at the time full stock engine, i havent noticed any performance gain. This initially disappointed me, given the price of it. However, i have noticed it benefit as i added more performance bolt-on additions to the car. I do believe that this intake can reach its peak potential HP gain when the entire engine itself has been upgraded such as: All bolt-ons, head porting, intake manifold porting and larger cam with the addition of a tune.
Overall quality of the product is relatively good, with the exception is that it is heavy (for an intake) and one could see the weld-marks inside the intake tubes. Kudos to how it looks though, definitely looks different then alot of other intakes out there.
I give it a 3 out of 5 because that is how it feels, average, the gains only show when the rest of the engine performance has improved.

By: swishaOwnership: 1 day - 1 weekgood exhaust! excellent fit, installed in about 30 minutes in my driveway with jack stands. however it is not 304 stainless steel as advertised *(the mufflers may be) and the mufflers look amazing like a mirror. but the rest of the tubing is not 304 it is a lower grade 409.

By: Y2KWS6Ownership: 1 month - 1 yearWelded it on instead of the clamps because i didnt want them to be visible. The sound is like no other and completely exceded my expectations. Highly recommend it to any one who wants to really let their f-body breath.

By: AnonymousOwnership: 1 day - 1 weekAfter listening to the sample SLP video of these pipes, we were impressed and bought them after listening to them all. Installation took 30 minutes just like the instructions said and these were very simple to install. Sound is amazing. We were not let down with this product and would recommend to anyone looking for a great sound with a quick and easy install that the do it yourself guy at home can do.

By: RedfishOwnership: 0 - 1 dayThe X pipe needs to be marked bottom or top. This would eliminate the guess work in installing it and aligning the rest of the exhaust system. In the instructions it says to use the two old muffler support hangers faceing outward. It should say the two faceing inward.Other than these two small details the fit is good and the sound is nice.

By: vdevineOwnership: 1 day - 1 weekI ordered the LM II's before my car arrived. I love the sound from the outside and that the resonance isn't bad within the cabin. But, you do know that it's a sports car and you can hear it coming and going now. Thanks, and check out the video of my SLP Loudmouth II Axle Back Exhaust:

By: CoutchOwnership: 1 day - 1 weektried to install it in a summit 58tb the instructions are clear and concise BUT it did not fit and the casting looks cheap not like a machined parts I will rewrite this once I get one that will fit and road test it for mph and dyno it
Coutch B 93 Camero z28 cam ugrade roller rockers, coil ,kn filter and tornado , 8 mil wires, headers,computer reprogram ,more to come .......

By: GMTechOwnership: 1 day - 1 weekTop quality workmanship! great fit! One note: to all Z71 Tahoe owners..you will need to trim a small portion of the bottom of the fender flare for chrome tip clearance. And if you have the factory accessory mud flaps it too will need to be trimmed. Gives a nice idle exhaust note..not too loud!

By: JimOwnership: 1 month - 1 yearInstallation Time ~1.5hours
Noticeable low end improvement
Great sound. On deceleration there is very audible "gurgle" in the exhaust.
Gas mileage actually decreased slightly. Expect that tuning and dyno time will improve both HP and MPG further.

By: USMUSLOwnership: 1 day - 1 weekMY STANG SOUNDS AWESOME NOW, LIKE A V8 MUSCLE CAR SHOULD. IT SEEMS LIKE ITS THREE TIMES LOUDER THAN STOCK! ITS EASILY THE LOUDEST STANG IN MY AREA NOW, AND AMONG THE LOUDEST MUSCLE CARS PERIOD, AND I HAVENT EVEN ADDED THE LONGTUBE HEADERS AND OFF ROAD H-PIPE YET!!!

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Originating in 2001 the work force at Late Model Performance has maintained a noteworthy high level of customer service and has made available a multifarious selection of new performance automotive parts and appurtenances represented by some of the preeminent names in the automotive performance parts industry. The vehicles represented range from 1950 to the present date and our inventory is tremendous and is continually rejuvenated for the purpose of offering an incomparable number and multiplicity of parts to meet the customer's every need. Our 5-star service is an additional reason to shop at Late Model Performance. All of our Performance Auto Parts include FREE Shipping and of course 5-star award winning customer service. See what LM Performance looked like in 2003.